The cavity within the inner shell could be exploited in several different ways.

"All of the beef is in the foam sandwich between the inner and outer shell."

She absorbed the pain of that blow, too, and shoved it into her inner shell where the damage wouldn't show.

Accordingly, the inner shell of the tunnel is up to 1 m thick.

But they didn't matter, because the machinery inside the body was set in metal casings which formed an inner shell.

What was that tough but corky substance lining the inner shell?

The inner shell was completed at the end of 1975.

For this reason, the inner shell of the tunnel in the area is up to 1 metre thick.

This inner shell however, does not quite touch the main shell.

The base of the firebox, where the inner and outer shells are joined.